LOW ENERGY ION-NEUTRAL REACTIONS .I. 22NE+ + 2ONE, AND AR+ + N2

A series of experiments has been performed using drift tube technique, in which both the primary and secondary ions are mass identified. Design of the apparatus is described briefly. Drift velocities of ions in the drift tube are measured with gate pulse technique. Cross sections of reactions 22Ne++20Ne→22Ne+20Ne + and Ar++N2→Ar+N2+ are determined as functions of mean energies of the ions in the range from 0.04 to 4 eV. Cross section of the former reaction decreases from 5.2±0.2–10-15 cm2 at 0.045 eV to 3.7±0.2~10-15 cm2 at 2.5 eV. Comparisons of measured cross section with the theory of Rapp-Francis and the previous experiments show that the technique and apparatus used are quite reliable. Cross section of the latter reaction increases from 3.0±0.3×10-16 cm2 at 0.43 eV to 2.2±0.2×10-15 cm2 at 4.4 eV, and it does not agree with the previous experiments using beam technique at higher energy. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.